Rotary collapsing tap



March 17, 1925. 1,550,293

A. F. BREITENSTEIN I ROTARY COLLAPSING TAP Filed may 8, 192 2 Sheets-Shoot 1 March 17, 1925.

F. BREITENSTEIN ROTARY COLLAPSING TAP Filed May 8, 1923 2 Sheets-Shoot 2 Patented Mar. 17, 1925 a i i UNITED STATES PATENT OFFICE.

ALBERT F. BREITENSTEIN, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE GEO- METRIC TOOL CO., OF NEW HAVEN, CONNECTICUT.

ROTARY GOLLA PSING TAP.

Application filed May 8, 1923. Serial No. 637,492.

To all whom it may concern: forward end the body is formed with four Be it known that I, ALBERT F. BREITEN- equidistant radial slots 16 respectively re- STEIN, a citizen of the United States, residceiving four chasers 17 held in place by a ing at New Haven, in the county of New cap 18 fastened by screws 19 to the front Haven and State 5 of Connecticut, have inface of the body. These chasers are formed, 60 vented a new and useful Improvement in in the usual manner, with inclined slots 20 Rotary Collapsing Taps; and I do hereby receiving undercut inclined ribs 21 formed declare the following, when taken in conintegral with the forward end of a'plunger nection with the accompanying drawings 22 located in a concentric bore' 23 in the and the characters of reference marked tap-body. 65 thereon, to be a full, clear, and exact de- The pawl-carrying ring 12 is coupled to scription of the same, and which said drawthe plunger 22 by means of a transverselyings constitute part of this application, and arranged coupling-bar 2a passing through represent, in a diametric slot 25 in the plunger, and Fig. 1 a view in front elevation of a rothrough a diametric clearance-slot 26 in the tary collapsing tap embodying my inventap-body, its ends being entered into slots tion. 27 in the ring itself, as shown in Fig. 5., Fig. 2 an underside view thereof with a whereby the ring moves the said plunger portion of the operating-ring broken away. when the tap is set, and the plunger moves Fig. 3 a view'thereof in central, longithe ring when the tap is tripped. The 75 tudinal section, as open. x clearance-slot 26 aforesaid in the tap-body Fig. 4 a corresponding view thereof, as is long enough to permit the ring and plungcollapsed. er to have sufficient conjoint movement to Fig. 5 a view in transverse section on the permit the collapsing and resetting of-the line 55 of Fig. 3. tap. so

Fig. 6 a view in side elevation, partly in At its rear end, the plunger is formed section, of one of the modified forms which with a threaded bore for the reception of my improvement may assume. the threaded inner end of a plunger-screw My invention relates to an improved ro- 28 mainly located in a bore 29 in the shank 30 tary collapsingtap, the object being to pro- 11. This screw carries a helical tap-ooh 86 vide, at a low cost for manufacture, a s1mlapsing spring 30, interposed between its ple, compact and reliable tap of the charhead 31 and a washer 32 abutted against a acter described. shoulder 33 produced at the inner end of With these ends in view, my invention the bore 29 by making the same'larger than 35 consists in a rotary collapsing tap having a the bore 23 formed in the tap-body for the locking-pawl released by the linear move rece tion of the plunger. ment of a member of the tap, preparatory to T e pawl 3 f aforesaid is located in a collapsing the same. longitudinal slot 35 formed in the periph- My invention further consists in a rotary ery of the pawl-carrying ring 12, mounted 40 collapsing tap having certain other details upon a pin 36 therein, and operated by a of construction as will be hereinafter de pawl-spring 37 encircling the said pin and scribed and pointed out in the claims. arranged to exert a constant effort to throw In carrying out my invention, as herein the pawl outward into its locking position, h I p y py 1O avlng an in which it engages with the beveled edge 45 integral shank 11, by means of which the of the forwardly-projecting, annular flange tap is mounted in the spindle or corre- 39 of the pawl-abutment rlng 15. For dissponding part of the machine in which the engaging the said pawl from the said edge tap is used. The said tap-body mounts a of the flange 39, the operatlng-sleeve 13 is pawl-carrying ring 12, which has shdlng formed with an inwardly-promot ng, an-

50 linear movement upon it and which in turn nular rib 40 which co-acts with the outer mounts an operating-sleeve 13, which has faceof the pawl to unlock the same. By sliding linear movement upon it. At is rear mounting the sleeve 13 upon the rmg 12, end the tap-body is formed with a threaded so as to have slld ng movement thereupon shoulder 14 for the reception of an internalfor forcing the pawl 3% into its retired posi- 66 ly-threaded pawl-abutment ring 15. At its tion, I secure not only marked economy of in the pawl-carrying ring space but the sleeve serves ,t oe Xelude-ichips and other foreign matter from the interior of the tap, and so avoids the fouling of the same. v

Fo the sliding linear movement of the operating-sleeve 13 upon the pawl-carry ing ring, the sleeve is provided at its rear end with an annular abutn ient-fiange 41, the opposite faces of which engage with suitable abutmentsassociated with the machine in whichthe tapisused, and not shown because common practice i For cushioning the collapsing action of the tap, 1 preferably employ a plurality of buifer-pinseZ (Figs. 3 and 4), each opera provides for turning the same as required for setting the chaser? and compensating for their wear.

In the operation of my improved rotary collapsing tap, the chasers are held in their projected or cutting positions, by the engagement of the pawl 34L, with the beveled forward edge of the flange 39 of the pawl abutment ring 15, as shown in Fig. 3. Just before the tapping has been carried to the required depth, the forward face of the tripping-flange 41 engages with one of the fixed abutments of the machine, whereby the forward movement of the operating-sleeve is arrested. In the further forward movement of the tap, the pawl 34: rides over the unlocking tripping-rib 4,0 of the sleeve,

whereby the pawl is lifted out of engagement with the edge of the flange 39 of the ring 15, thus releasing the plunger 22 to the action of its spring 30, which immediately retracts it, with the effect of collapsing or retracting the chasers 17. The tap, now withdrawn from the work, moves rearward ly snl'iiciently to canset he rear face of the flange =ll' of the operating-ring'13 to engage with the other fixed abutment of the machine, whereby the rearward movementof the operating-ring is arrested, as well as the rearward movementtogether of the pawl carrying ring and plunger. The continued rearward movement of the tap-body compresses the collapsing-spring and forces the chasers into their cutting or projected positions, this rearward movement of the tap-body, while the pawl-carrying ring and plunger are held stationary, being permitted by the clearance-slot 26 in the tap-body. At the limit of the latter movement, the edge of the flange 39 has been moved snficiently 'e. big. o

nation with throw the pawl into its locking position, as

shown in Fig. 3. The device having been thus re-cocked or re -set, is i eady for another threading operation.

In the modified construction shown by of the drawings, the flange 41 of the sleeve 13 is dispensed with and replaced by a tripping plate t7, which engages directly with the work for tripping the device, this ,plate being fastened to two oppositely-located arms 48 adjustably secured by bolts ditto the operatingu ing 13. Under this qmstrnction therear face 50 of the operating ring 13 engages with the fixed abutment of the machine for cooking the device.

I claimq t p I j l. In, a rotary collapsing tap, the combination with the body, chasers, plungen and coll apsingspring thereof of a ring having sliding movement upon theisaid body and connected withthe said plunger for move ment ther with, an operating-sleeve"having sliding movement upon the said ring, a detent carried by the saidring and moved into its retired position by the sliding of the said sleeve thereupon, and an abutment-membe;

mounted upon the body and c o ae'ting with the sa d detent for holdlng the chasers in their pro ected positionsagainst the tension of the said collapsing 'spring to the action of which they are released forbeing collapsed, by the retirement of the said detent by the said sleeve.

:3. in a rotary collapsing-spring thereofnof a ring having sl d ng movement upon the'said body and connected with the said plunger forfinove;

l tl lllt therewith, an o mnngemeve having sliding ii'lovement upon the said'ringfa detent carr ed by the said ring and moved into its ret red position by the slidlng'o'f the said sleeve thereupon, and an abutment ring mounted upon thesaid body and 'co a'cting with the said detent to hold thechasers in their projected positionsngainst the "ten ,sion of the said collapsing-spring to the actionofwhich they are released for'being sliding movement upon the said ring, a detent carried by the said ring, and an abutment-ring adjnstably mounted upon the said body in position to co-a ct with the said detent and telescoping within the said sleeve.

4. In, a rotary collapsing tap, the combithe body, ehaser's, plunger and collapsing-spring thereof, of pawl-carry- I collapsing tap, thebombi 11;!(1011 with the body, chasers,plunger and ing ring mounted upon the said body and having sliding movement thereon, a pawl carried by the said ring and having swinging movement in a plane parallel with the longitudinal axis of the tap, an operatingsleeve having sliding movement upon the pawl-carrying ring and moved into its reby the sliding and a pawl-abutment ring mounted upon the body and co-acting with the said pawl for holding the chasers in their cutting positions against the tension of the collapsing-spring to the action of which they are released for being collapsed by the retirement of the said detent by the said sleeve.

5. In a rotary collapsing tap, the combination with the body, chasers, plunger and collapsing-spring thereof; of a ring having sliding movement upon the said body, a pawl carried by the said ring in position to swing in a plane parallel with the longitudi nal axis of the tap, an operating-sleeve having sliding movement upon the pawl-carrying ring and moved into its retired position by the sliding of the said sleeve thereupon, a pawl-abutment ring mounted upon the tap-body arid co-acting with the said pawl for holding the chasers in their cutting positions against the tension of the collapsingspring to the action of which they are release for being collapsed by the retirement of the said detent by the said sleeve, and means interposed between the pawl-carrying ring and the pawl-abutment ring for cushioning the collapsing action of the device.

6. In a rotary collapsing tap, the combination with the body, chasers, plunger and collapsing-spring thereof; of a ring having sliding movement upon the tap-body, a pawl carried by the said ring and swinging in a plane parallel with the longitudinal axis of the tap, an operating-sleeve having sliding movement upon the pawlcarrying ring and moved into its retired position by the sliding of the said sleeve thereupon, a pawlabutment ring mounted upon the tap-body and co-acting with the said pawl for holding the chasers in their cutting positions against the tension of the collapsing-spring to the action of which they are released for being collapsed by the retirement of the said detent by the said sleeve, and buffer-pins mounted in the pawl-carrying ring and coacting with the pawl-abutment ring for cushioning the collapsing action of the de-' vice.

7. In a rotary collapsing tap, the combination with the body, chasers, plunger and collapsing-spring thereof; of a ring having sliding movement upon the said body and coupled with the said plunger for movement therewith, an operating-sleeve having sliding movement upon' the said ring and provided with an annular tripping-flange, a

tired position sleeve thereupon,

of the said.

detent carried by the said ring and moved into its retired position by the sliding of the said sleeve thereupon, and an abutmentmember carried by the said body in position to 'coact with the said detent for holding the cutters in their projected positions against the power of the collapsing-spring to the action of which they are released for being collapsed by the retirement of the said de tent by the said sleeve.

8. In a. rotary collapsing tap, the combination with the body, chasers, plunger and collapsing-spring thereof; of a pawl-carry ing ring having sliding movement upon the body, an operating-sleeve having sliding movement upon the pawl-carrying ring, a coupling-bar passing through the plunger and body and entering the pawl-carrying ring for coupling the same to the plunger, and a pawl positioned in the pawl-carrying ring so as to swing in a plane parallel with the longitudinal axis of the tap, operated by the said operating-sleeve for collapsing the tap, and co-acting with a fixed part of the tap to hold the chasers in their cutting positions.

9. In a rotary collapsing tap, the combination with the body, plunger, chasers and collapsing-spring thereof; of a pawl-carrying ring having sliding movement upon the (1 body, an operating-sleeve having sliding movement upon the awl-carrying ring and moved into its retiree position by the sliding of the said sleeve thereupon a pawl-abutment ring adj ustably mounted upon the body and having a forwardly-extending flange, and a pawl mounted in the pawl-carrying ring, so as to swing in a plane parallel with the longitudinal axis of the tap, and coacting with the said flange for holding the chasers in their cutting positions against the opposition of the collapsing-spring to the action of which they are released for being collapsed by the retirement of the said detent by the said sleeve.

10. In a rotary collapsing tap, the combination with the body, chasers, plunger and collapsing-spring thereof; of a pawl-carrying ring mounted upon the said body and having sliding movement thereon, a pawl carried by the said ring and having swinging movement in a plane parallel with the longitudinal axis of the tap, and an operating-sleeve having sliding movement upon the said pawl-carrying ring and provided with an annular rib co-acting directly with. the said pawl to unlock the same.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

ALBERT F. BREITENSTEIN.

Witnesses:

GEORGE L. DRAFFAN, FREDERICK O. UIHLEIN. 

